Which of following is a disadvantage in using a cell (or mobile) phones as an emergency backup communication system?

A) Cell (mobile) phones do not offer high-quality sound
B) There is less privacy when using cell phones, as compared to radios
C) Cell (mobile) phone use is not monitored by the FCC
D) Cell (mobile) phones may not be effective in disaster situations

D) Cell (mobile) phones may not be effective in disaster situations